diff --git a/offlineimap/threadutil.py b/offlineimap/threadutil.py
index 599aa8d..afcad25 100644
--- a/offlineimap/threadutil.py
+++ b/offlineimap/threadutil.py
@@ -115,7 +115,6 @@ def exitnotifymonitorloop(callback):
         try:
             thrd = exitthreads.get(False)
             callback(thrd)
-            exitthreads.task_done()
         except Empty:
             time.sleep(1)